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Finding the Fourth Proportional to 215.84, 323.72 and 61.78

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Solution

The fourth proportional to 215.84, 323.72 and 61.78 is: 92.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.84 : 323.72 = 61.78 : x
  2. Step 2: Convert to fraction form
    215.84/323.72 = 61.78/x
  3. Step 3: Cross multiply
    215.84x = 323.72 × 61.78
  4. Step 4: Simplify right side
    215.84x = 19,999.42
  5. Step 5: Solve for x
    x = 19,999.42/215.84
  6. Step 6: Final answer
    x = 92.66

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.